1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 3 #include <linux/errno.h> 4 #include <linux/file.h> 5 #include <linux/slab.h> 6 #include <linux/net.h> 7 #include <linux/compat.h> 8 #include <net/compat.h> 9 #include <linux/io_uring.h> 10 11 #include <uapi/linux/io_uring.h> 12 13 #include "io_uring.h" 14 #include "kbuf.h" 15 #include "alloc_cache.h" 16 #include "net.h" 17 #include "notif.h" 18 #include "rsrc.h" 19 20 #if defined(CONFIG_NET) 21 struct io_shutdown { 22 struct file *file; 23 int how; 24 }; 25 26 struct io_accept { 27 struct file *file; 28 struct sockaddr __user *addr; 29 int __user *addr_len; 30 int flags; 31 u32 file_slot; 32 unsigned long nofile; 33 }; 34 35 struct io_socket { 36 struct file *file; 37 int domain; 38 int type; 39 int protocol; 40 int flags; 41 u32 file_slot; 42 unsigned long nofile; 43 }; 44 45 struct io_connect { 46 struct file *file; 47 struct sockaddr __user *addr; 48 int addr_len; 49 bool in_progress; 50 }; 51 52 struct io_sr_msg { 53 struct file *file; 54 union { 55 struct compat_msghdr __user *umsg_compat; 56 struct user_msghdr __user *umsg; 57 void __user *buf; 58 }; 59 unsigned len; 60 unsigned done_io; 61 unsigned msg_flags; 62 u16 flags; 63 /* initialised and used only by !msg send variants */ 64 u16 addr_len; 65 void __user *addr; 66 /* used only for send zerocopy */ 67 struct io_kiocb *notif; 68 }; 69 70 static inline bool io_check_multishot(struct io_kiocb *req, 71 unsigned int issue_flags) 72 { 73 /* 74 * When ->locked_cq is set we only allow to post CQEs from the original 75 * task context. Usual request completions will be handled in other 76 * generic paths but multipoll may decide to post extra cqes. 77 */ 78 return !(issue_flags & IO_URING_F_IOWQ) || 79 !(issue_flags & IO_URING_F_MULTISHOT) || 80 !req->ctx->task_complete; 81 } 82 83 int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 84 { 85 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 86 87 if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || 88 sqe->buf_index || sqe->splice_fd_in)) 89 return -EINVAL; 90 91 shutdown->how = READ_ONCE(sqe->len); 92 return 0; 93 } 94 95 int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) 96 { 97 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 98 struct socket *sock; 99 int ret; 100 101 if (issue_flags & IO_URING_F_NONBLOCK) 102 return -EAGAIN; 103 104 sock = sock_from_file(req->file); 105 if (unlikely(!sock)) 106 return -ENOTSOCK; 107 108 ret = __sys_shutdown_sock(sock, shutdown->how); 109 io_req_set_res(req, ret, 0); 110 return IOU_OK; 111 } 112 113 static bool io_net_retry(struct socket *sock, int flags) 114 { 115 if (!(flags & MSG_WAITALL)) 116 return false; 117 return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; 118 } 119 120 static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) 121 { 122 struct io_async_msghdr *hdr = req->async_data; 123 124 if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED) 125 return; 126 127 /* Let normal cleanup path reap it if we fail adding to the cache */ 128 if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { 129 req->async_data = NULL; 130 req->flags &= ~REQ_F_ASYNC_DATA; 131 } 132 } 133 134 static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req, 135 unsigned int issue_flags) 136 { 137 struct io_ring_ctx *ctx = req->ctx; 138 struct io_cache_entry *entry; 139 struct io_async_msghdr *hdr; 140 141 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 142 entry = io_alloc_cache_get(&ctx->netmsg_cache); 143 if (entry) { 144 hdr = container_of(entry, struct io_async_msghdr, cache); 145 hdr->free_iov = NULL; 146 req->flags |= REQ_F_ASYNC_DATA; 147 req->async_data = hdr; 148 return hdr; 149 } 150 } 151 152 if (!io_alloc_async_data(req)) { 153 hdr = req->async_data; 154 hdr->free_iov = NULL; 155 return hdr; 156 } 157 return NULL; 158 } 159 160 static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req) 161 { 162 /* ->prep_async is always called from the submission context */ 163 return io_msg_alloc_async(req, 0); 164 } 165 166 static int io_setup_async_msg(struct io_kiocb *req, 167 struct io_async_msghdr *kmsg, 168 unsigned int issue_flags) 169 { 170 struct io_async_msghdr *async_msg; 171 172 if (req_has_async_data(req)) 173 return -EAGAIN; 174 async_msg = io_msg_alloc_async(req, issue_flags); 175 if (!async_msg) { 176 kfree(kmsg->free_iov); 177 return -ENOMEM; 178 } 179 req->flags |= REQ_F_NEED_CLEANUP; 180 memcpy(async_msg, kmsg, sizeof(*kmsg)); 181 if (async_msg->msg.msg_name) 182 async_msg->msg.msg_name = &async_msg->addr; 183 /* if were using fast_iov, set it to the new one */ 184 if (!kmsg->free_iov) { 185 size_t fast_idx = kmsg->msg.msg_iter.iov - kmsg->fast_iov; 186 async_msg->msg.msg_iter.iov = &async_msg->fast_iov[fast_idx]; 187 } 188 189 return -EAGAIN; 190 } 191 192 static int io_sendmsg_copy_hdr(struct io_kiocb *req, 193 struct io_async_msghdr *iomsg) 194 { 195 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 196 197 iomsg->msg.msg_name = &iomsg->addr; 198 iomsg->free_iov = iomsg->fast_iov; 199 return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, 200 &iomsg->free_iov); 201 } 202 203 int io_send_prep_async(struct io_kiocb *req) 204 { 205 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 206 struct io_async_msghdr *io; 207 int ret; 208 209 if (!zc->addr || req_has_async_data(req)) 210 return 0; 211 io = io_msg_alloc_async_prep(req); 212 if (!io) 213 return -ENOMEM; 214 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); 215 return ret; 216 } 217 218 static int io_setup_async_addr(struct io_kiocb *req, 219 struct sockaddr_storage *addr_storage, 220 unsigned int issue_flags) 221 { 222 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 223 struct io_async_msghdr *io; 224 225 if (!sr->addr || req_has_async_data(req)) 226 return -EAGAIN; 227 io = io_msg_alloc_async(req, issue_flags); 228 if (!io) 229 return -ENOMEM; 230 memcpy(&io->addr, addr_storage, sizeof(io->addr)); 231 return -EAGAIN; 232 } 233 234 int io_sendmsg_prep_async(struct io_kiocb *req) 235 { 236 int ret; 237 238 if (!io_msg_alloc_async_prep(req)) 239 return -ENOMEM; 240 ret = io_sendmsg_copy_hdr(req, req->async_data); 241 if (!ret) 242 req->flags |= REQ_F_NEED_CLEANUP; 243 return ret; 244 } 245 246 void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) 247 { 248 struct io_async_msghdr *io = req->async_data; 249 250 kfree(io->free_iov); 251 } 252 253 int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 254 { 255 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 256 257 if (req->opcode == IORING_OP_SEND) { 258 if (READ_ONCE(sqe->__pad3[0])) 259 return -EINVAL; 260 sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 261 sr->addr_len = READ_ONCE(sqe->addr_len); 262 } else if (sqe->addr2 || sqe->file_index) { 263 return -EINVAL; 264 } 265 266 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 267 sr->len = READ_ONCE(sqe->len); 268 sr->flags = READ_ONCE(sqe->ioprio); 269 if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) 270 return -EINVAL; 271 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 272 if (sr->msg_flags & MSG_DONTWAIT) 273 req->flags |= REQ_F_NOWAIT; 274 275 #ifdef CONFIG_COMPAT 276 if (req->ctx->compat) 277 sr->msg_flags |= MSG_CMSG_COMPAT; 278 #endif 279 sr->done_io = 0; 280 return 0; 281 } 282 283 int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) 284 { 285 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 286 struct io_async_msghdr iomsg, *kmsg; 287 struct socket *sock; 288 unsigned flags; 289 int min_ret = 0; 290 int ret; 291 292 sock = sock_from_file(req->file); 293 if (unlikely(!sock)) 294 return -ENOTSOCK; 295 296 if (req_has_async_data(req)) { 297 kmsg = req->async_data; 298 } else { 299 ret = io_sendmsg_copy_hdr(req, &iomsg); 300 if (ret) 301 return ret; 302 kmsg = &iomsg; 303 } 304 305 if (!(req->flags & REQ_F_POLLED) && 306 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 307 return io_setup_async_msg(req, kmsg, issue_flags); 308 309 flags = sr->msg_flags; 310 if (issue_flags & IO_URING_F_NONBLOCK) 311 flags |= MSG_DONTWAIT; 312 if (flags & MSG_WAITALL) 313 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 314 315 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); 316 317 if (ret < min_ret) { 318 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 319 return io_setup_async_msg(req, kmsg, issue_flags); 320 if (ret > 0 && io_net_retry(sock, flags)) { 321 sr->done_io += ret; 322 req->flags |= REQ_F_PARTIAL_IO; 323 return io_setup_async_msg(req, kmsg, issue_flags); 324 } 325 if (ret == -ERESTARTSYS) 326 ret = -EINTR; 327 req_set_fail(req); 328 } 329 /* fast path, check for non-NULL to avoid function call */ 330 if (kmsg->free_iov) 331 kfree(kmsg->free_iov); 332 req->flags &= ~REQ_F_NEED_CLEANUP; 333 io_netmsg_recycle(req, issue_flags); 334 if (ret >= 0) 335 ret += sr->done_io; 336 else if (sr->done_io) 337 ret = sr->done_io; 338 io_req_set_res(req, ret, 0); 339 return IOU_OK; 340 } 341 342 int io_send(struct io_kiocb *req, unsigned int issue_flags) 343 { 344 struct sockaddr_storage __address; 345 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 346 struct msghdr msg; 347 struct iovec iov; 348 struct socket *sock; 349 unsigned flags; 350 int min_ret = 0; 351 int ret; 352 353 msg.msg_name = NULL; 354 msg.msg_control = NULL; 355 msg.msg_controllen = 0; 356 msg.msg_namelen = 0; 357 msg.msg_ubuf = NULL; 358 359 if (sr->addr) { 360 if (req_has_async_data(req)) { 361 struct io_async_msghdr *io = req->async_data; 362 363 msg.msg_name = &io->addr; 364 } else { 365 ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address); 366 if (unlikely(ret < 0)) 367 return ret; 368 msg.msg_name = (struct sockaddr *)&__address; 369 } 370 msg.msg_namelen = sr->addr_len; 371 } 372 373 if (!(req->flags & REQ_F_POLLED) && 374 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 375 return io_setup_async_addr(req, &__address, issue_flags); 376 377 sock = sock_from_file(req->file); 378 if (unlikely(!sock)) 379 return -ENOTSOCK; 380 381 ret = import_single_range(ITER_SOURCE, sr->buf, sr->len, &iov, &msg.msg_iter); 382 if (unlikely(ret)) 383 return ret; 384 385 flags = sr->msg_flags; 386 if (issue_flags & IO_URING_F_NONBLOCK) 387 flags |= MSG_DONTWAIT; 388 if (flags & MSG_WAITALL) 389 min_ret = iov_iter_count(&msg.msg_iter); 390 391 msg.msg_flags = flags; 392 ret = sock_sendmsg(sock, &msg); 393 if (ret < min_ret) { 394 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 395 return io_setup_async_addr(req, &__address, issue_flags); 396 397 if (ret > 0 && io_net_retry(sock, flags)) { 398 sr->len -= ret; 399 sr->buf += ret; 400 sr->done_io += ret; 401 req->flags |= REQ_F_PARTIAL_IO; 402 return io_setup_async_addr(req, &__address, issue_flags); 403 } 404 if (ret == -ERESTARTSYS) 405 ret = -EINTR; 406 req_set_fail(req); 407 } 408 if (ret >= 0) 409 ret += sr->done_io; 410 else if (sr->done_io) 411 ret = sr->done_io; 412 io_req_set_res(req, ret, 0); 413 return IOU_OK; 414 } 415 416 static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) 417 { 418 int hdr; 419 420 if (iomsg->namelen < 0) 421 return true; 422 if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), 423 iomsg->namelen, &hdr)) 424 return true; 425 if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) 426 return true; 427 428 return false; 429 } 430 431 static int __io_recvmsg_copy_hdr(struct io_kiocb *req, 432 struct io_async_msghdr *iomsg) 433 { 434 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 435 struct user_msghdr msg; 436 int ret; 437 438 if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) 439 return -EFAULT; 440 441 ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); 442 if (ret) 443 return ret; 444 445 if (req->flags & REQ_F_BUFFER_SELECT) { 446 if (msg.msg_iovlen == 0) { 447 sr->len = iomsg->fast_iov[0].iov_len = 0; 448 iomsg->fast_iov[0].iov_base = NULL; 449 iomsg->free_iov = NULL; 450 } else if (msg.msg_iovlen > 1) { 451 return -EINVAL; 452 } else { 453 if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) 454 return -EFAULT; 455 sr->len = iomsg->fast_iov[0].iov_len; 456 iomsg->free_iov = NULL; 457 } 458 459 if (req->flags & REQ_F_APOLL_MULTISHOT) { 460 iomsg->namelen = msg.msg_namelen; 461 iomsg->controllen = msg.msg_controllen; 462 if (io_recvmsg_multishot_overflow(iomsg)) 463 return -EOVERFLOW; 464 } 465 } else { 466 iomsg->free_iov = iomsg->fast_iov; 467 ret = __import_iovec(ITER_DEST, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, 468 &iomsg->free_iov, &iomsg->msg.msg_iter, 469 false); 470 if (ret > 0) 471 ret = 0; 472 } 473 474 return ret; 475 } 476 477 #ifdef CONFIG_COMPAT 478 static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, 479 struct io_async_msghdr *iomsg) 480 { 481 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 482 struct compat_msghdr msg; 483 struct compat_iovec __user *uiov; 484 int ret; 485 486 if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg))) 487 return -EFAULT; 488 489 ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); 490 if (ret) 491 return ret; 492 493 uiov = compat_ptr(msg.msg_iov); 494 if (req->flags & REQ_F_BUFFER_SELECT) { 495 compat_ssize_t clen; 496 497 iomsg->free_iov = NULL; 498 if (msg.msg_iovlen == 0) { 499 sr->len = 0; 500 } else if (msg.msg_iovlen > 1) { 501 return -EINVAL; 502 } else { 503 if (!access_ok(uiov, sizeof(*uiov))) 504 return -EFAULT; 505 if (__get_user(clen, &uiov->iov_len)) 506 return -EFAULT; 507 if (clen < 0) 508 return -EINVAL; 509 sr->len = clen; 510 } 511 512 if (req->flags & REQ_F_APOLL_MULTISHOT) { 513 iomsg->namelen = msg.msg_namelen; 514 iomsg->controllen = msg.msg_controllen; 515 if (io_recvmsg_multishot_overflow(iomsg)) 516 return -EOVERFLOW; 517 } 518 } else { 519 iomsg->free_iov = iomsg->fast_iov; 520 ret = __import_iovec(ITER_DEST, (struct iovec __user *)uiov, msg.msg_iovlen, 521 UIO_FASTIOV, &iomsg->free_iov, 522 &iomsg->msg.msg_iter, true); 523 if (ret < 0) 524 return ret; 525 } 526 527 return 0; 528 } 529 #endif 530 531 static int io_recvmsg_copy_hdr(struct io_kiocb *req, 532 struct io_async_msghdr *iomsg) 533 { 534 iomsg->msg.msg_name = &iomsg->addr; 535 536 #ifdef CONFIG_COMPAT 537 if (req->ctx->compat) 538 return __io_compat_recvmsg_copy_hdr(req, iomsg); 539 #endif 540 541 return __io_recvmsg_copy_hdr(req, iomsg); 542 } 543 544 int io_recvmsg_prep_async(struct io_kiocb *req) 545 { 546 int ret; 547 548 if (!io_msg_alloc_async_prep(req)) 549 return -ENOMEM; 550 ret = io_recvmsg_copy_hdr(req, req->async_data); 551 if (!ret) 552 req->flags |= REQ_F_NEED_CLEANUP; 553 return ret; 554 } 555 556 #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) 557 558 int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 559 { 560 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 561 562 if (unlikely(sqe->file_index || sqe->addr2)) 563 return -EINVAL; 564 565 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 566 sr->len = READ_ONCE(sqe->len); 567 sr->flags = READ_ONCE(sqe->ioprio); 568 if (sr->flags & ~(RECVMSG_FLAGS)) 569 return -EINVAL; 570 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 571 if (sr->msg_flags & MSG_DONTWAIT) 572 req->flags |= REQ_F_NOWAIT; 573 if (sr->msg_flags & MSG_ERRQUEUE) 574 req->flags |= REQ_F_CLEAR_POLLIN; 575 if (sr->flags & IORING_RECV_MULTISHOT) { 576 if (!(req->flags & REQ_F_BUFFER_SELECT)) 577 return -EINVAL; 578 if (sr->msg_flags & MSG_WAITALL) 579 return -EINVAL; 580 if (req->opcode == IORING_OP_RECV && sr->len) 581 return -EINVAL; 582 req->flags |= REQ_F_APOLL_MULTISHOT; 583 } 584 585 #ifdef CONFIG_COMPAT 586 if (req->ctx->compat) 587 sr->msg_flags |= MSG_CMSG_COMPAT; 588 #endif 589 sr->done_io = 0; 590 return 0; 591 } 592 593 static inline void io_recv_prep_retry(struct io_kiocb *req) 594 { 595 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 596 597 sr->done_io = 0; 598 sr->len = 0; /* get from the provided buffer */ 599 } 600 601 /* 602 * Finishes io_recv and io_recvmsg. 603 * 604 * Returns true if it is actually finished, or false if it should run 605 * again (for multishot). 606 */ 607 static inline bool io_recv_finish(struct io_kiocb *req, int *ret, 608 unsigned int cflags, bool mshot_finished, 609 unsigned issue_flags) 610 { 611 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 612 io_req_set_res(req, *ret, cflags); 613 *ret = IOU_OK; 614 return true; 615 } 616 617 if (!mshot_finished) { 618 if (io_aux_cqe(req->ctx, issue_flags & IO_URING_F_COMPLETE_DEFER, 619 req->cqe.user_data, *ret, cflags | IORING_CQE_F_MORE, true)) { 620 io_recv_prep_retry(req); 621 return false; 622 } 623 /* Otherwise stop multishot but use the current result. */ 624 } 625 626 io_req_set_res(req, *ret, cflags); 627 628 if (issue_flags & IO_URING_F_MULTISHOT) 629 *ret = IOU_STOP_MULTISHOT; 630 else 631 *ret = IOU_OK; 632 return true; 633 } 634 635 static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg, 636 struct io_sr_msg *sr, void __user **buf, 637 size_t *len) 638 { 639 unsigned long ubuf = (unsigned long) *buf; 640 unsigned long hdr; 641 642 hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 643 kmsg->controllen; 644 if (*len < hdr) 645 return -EFAULT; 646 647 if (kmsg->controllen) { 648 unsigned long control = ubuf + hdr - kmsg->controllen; 649 650 kmsg->msg.msg_control_user = (void __user *) control; 651 kmsg->msg.msg_controllen = kmsg->controllen; 652 } 653 654 sr->buf = *buf; /* stash for later copy */ 655 *buf = (void __user *) (ubuf + hdr); 656 kmsg->payloadlen = *len = *len - hdr; 657 return 0; 658 } 659 660 struct io_recvmsg_multishot_hdr { 661 struct io_uring_recvmsg_out msg; 662 struct sockaddr_storage addr; 663 }; 664 665 static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io, 666 struct io_async_msghdr *kmsg, 667 unsigned int flags, bool *finished) 668 { 669 int err; 670 int copy_len; 671 struct io_recvmsg_multishot_hdr hdr; 672 673 if (kmsg->namelen) 674 kmsg->msg.msg_name = &hdr.addr; 675 kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 676 kmsg->msg.msg_namelen = 0; 677 678 if (sock->file->f_flags & O_NONBLOCK) 679 flags |= MSG_DONTWAIT; 680 681 err = sock_recvmsg(sock, &kmsg->msg, flags); 682 *finished = err <= 0; 683 if (err < 0) 684 return err; 685 686 hdr.msg = (struct io_uring_recvmsg_out) { 687 .controllen = kmsg->controllen - kmsg->msg.msg_controllen, 688 .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT 689 }; 690 691 hdr.msg.payloadlen = err; 692 if (err > kmsg->payloadlen) 693 err = kmsg->payloadlen; 694 695 copy_len = sizeof(struct io_uring_recvmsg_out); 696 if (kmsg->msg.msg_namelen > kmsg->namelen) 697 copy_len += kmsg->namelen; 698 else 699 copy_len += kmsg->msg.msg_namelen; 700 701 /* 702 * "fromlen shall refer to the value before truncation.." 703 * 1003.1g 704 */ 705 hdr.msg.namelen = kmsg->msg.msg_namelen; 706 707 /* ensure that there is no gap between hdr and sockaddr_storage */ 708 BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) != 709 sizeof(struct io_uring_recvmsg_out)); 710 if (copy_to_user(io->buf, &hdr, copy_len)) { 711 *finished = true; 712 return -EFAULT; 713 } 714 715 return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 716 kmsg->controllen + err; 717 } 718 719 int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) 720 { 721 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 722 struct io_async_msghdr iomsg, *kmsg; 723 struct socket *sock; 724 unsigned int cflags; 725 unsigned flags; 726 int ret, min_ret = 0; 727 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 728 bool mshot_finished = true; 729 730 sock = sock_from_file(req->file); 731 if (unlikely(!sock)) 732 return -ENOTSOCK; 733 734 if (req_has_async_data(req)) { 735 kmsg = req->async_data; 736 } else { 737 ret = io_recvmsg_copy_hdr(req, &iomsg); 738 if (ret) 739 return ret; 740 kmsg = &iomsg; 741 } 742 743 if (!(req->flags & REQ_F_POLLED) && 744 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 745 return io_setup_async_msg(req, kmsg, issue_flags); 746 747 if (!io_check_multishot(req, issue_flags)) 748 return io_setup_async_msg(req, kmsg, issue_flags); 749 750 retry_multishot: 751 if (io_do_buffer_select(req)) { 752 void __user *buf; 753 size_t len = sr->len; 754 755 buf = io_buffer_select(req, &len, issue_flags); 756 if (!buf) 757 return -ENOBUFS; 758 759 if (req->flags & REQ_F_APOLL_MULTISHOT) { 760 ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len); 761 if (ret) { 762 io_kbuf_recycle(req, issue_flags); 763 return ret; 764 } 765 } 766 767 kmsg->fast_iov[0].iov_base = buf; 768 kmsg->fast_iov[0].iov_len = len; 769 iov_iter_init(&kmsg->msg.msg_iter, ITER_DEST, kmsg->fast_iov, 1, 770 len); 771 } 772 773 flags = sr->msg_flags; 774 if (force_nonblock) 775 flags |= MSG_DONTWAIT; 776 if (flags & MSG_WAITALL) 777 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 778 779 kmsg->msg.msg_get_inq = 1; 780 if (req->flags & REQ_F_APOLL_MULTISHOT) 781 ret = io_recvmsg_multishot(sock, sr, kmsg, flags, 782 &mshot_finished); 783 else 784 ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, 785 kmsg->uaddr, flags); 786 787 if (ret < min_ret) { 788 if (ret == -EAGAIN && force_nonblock) { 789 ret = io_setup_async_msg(req, kmsg, issue_flags); 790 if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) { 791 io_kbuf_recycle(req, issue_flags); 792 return IOU_ISSUE_SKIP_COMPLETE; 793 } 794 return ret; 795 } 796 if (ret > 0 && io_net_retry(sock, flags)) { 797 sr->done_io += ret; 798 req->flags |= REQ_F_PARTIAL_IO; 799 return io_setup_async_msg(req, kmsg, issue_flags); 800 } 801 if (ret == -ERESTARTSYS) 802 ret = -EINTR; 803 req_set_fail(req); 804 } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 805 req_set_fail(req); 806 } 807 808 if (ret > 0) 809 ret += sr->done_io; 810 else if (sr->done_io) 811 ret = sr->done_io; 812 else 813 io_kbuf_recycle(req, issue_flags); 814 815 cflags = io_put_kbuf(req, issue_flags); 816 if (kmsg->msg.msg_inq) 817 cflags |= IORING_CQE_F_SOCK_NONEMPTY; 818 819 if (!io_recv_finish(req, &ret, cflags, mshot_finished, issue_flags)) 820 goto retry_multishot; 821 822 if (mshot_finished) { 823 /* fast path, check for non-NULL to avoid function call */ 824 if (kmsg->free_iov) 825 kfree(kmsg->free_iov); 826 io_netmsg_recycle(req, issue_flags); 827 req->flags &= ~REQ_F_NEED_CLEANUP; 828 } 829 830 return ret; 831 } 832 833 int io_recv(struct io_kiocb *req, unsigned int issue_flags) 834 { 835 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 836 struct msghdr msg; 837 struct socket *sock; 838 struct iovec iov; 839 unsigned int cflags; 840 unsigned flags; 841 int ret, min_ret = 0; 842 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 843 size_t len = sr->len; 844 845 if (!(req->flags & REQ_F_POLLED) && 846 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 847 return -EAGAIN; 848 849 if (!io_check_multishot(req, issue_flags)) 850 return -EAGAIN; 851 852 sock = sock_from_file(req->file); 853 if (unlikely(!sock)) 854 return -ENOTSOCK; 855 856 retry_multishot: 857 if (io_do_buffer_select(req)) { 858 void __user *buf; 859 860 buf = io_buffer_select(req, &len, issue_flags); 861 if (!buf) 862 return -ENOBUFS; 863 sr->buf = buf; 864 } 865 866 ret = import_single_range(ITER_DEST, sr->buf, len, &iov, &msg.msg_iter); 867 if (unlikely(ret)) 868 goto out_free; 869 870 msg.msg_name = NULL; 871 msg.msg_namelen = 0; 872 msg.msg_control = NULL; 873 msg.msg_get_inq = 1; 874 msg.msg_flags = 0; 875 msg.msg_controllen = 0; 876 msg.msg_iocb = NULL; 877 msg.msg_ubuf = NULL; 878 879 flags = sr->msg_flags; 880 if (force_nonblock) 881 flags |= MSG_DONTWAIT; 882 if (flags & MSG_WAITALL) 883 min_ret = iov_iter_count(&msg.msg_iter); 884 885 ret = sock_recvmsg(sock, &msg, flags); 886 if (ret < min_ret) { 887 if (ret == -EAGAIN && force_nonblock) { 888 if (issue_flags & IO_URING_F_MULTISHOT) { 889 io_kbuf_recycle(req, issue_flags); 890 return IOU_ISSUE_SKIP_COMPLETE; 891 } 892 893 return -EAGAIN; 894 } 895 if (ret > 0 && io_net_retry(sock, flags)) { 896 sr->len -= ret; 897 sr->buf += ret; 898 sr->done_io += ret; 899 req->flags |= REQ_F_PARTIAL_IO; 900 return -EAGAIN; 901 } 902 if (ret == -ERESTARTSYS) 903 ret = -EINTR; 904 req_set_fail(req); 905 } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 906 out_free: 907 req_set_fail(req); 908 } 909 910 if (ret > 0) 911 ret += sr->done_io; 912 else if (sr->done_io) 913 ret = sr->done_io; 914 else 915 io_kbuf_recycle(req, issue_flags); 916 917 cflags = io_put_kbuf(req, issue_flags); 918 if (msg.msg_inq) 919 cflags |= IORING_CQE_F_SOCK_NONEMPTY; 920 921 if (!io_recv_finish(req, &ret, cflags, ret <= 0, issue_flags)) 922 goto retry_multishot; 923 924 return ret; 925 } 926 927 void io_send_zc_cleanup(struct io_kiocb *req) 928 { 929 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 930 struct io_async_msghdr *io; 931 932 if (req_has_async_data(req)) { 933 io = req->async_data; 934 /* might be ->fast_iov if *msg_copy_hdr failed */ 935 if (io->free_iov != io->fast_iov) 936 kfree(io->free_iov); 937 } 938 if (zc->notif) { 939 io_notif_flush(zc->notif); 940 zc->notif = NULL; 941 } 942 } 943 944 #define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF) 945 #define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE) 946 947 int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 948 { 949 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 950 struct io_ring_ctx *ctx = req->ctx; 951 struct io_kiocb *notif; 952 953 if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3))) 954 return -EINVAL; 955 /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */ 956 if (req->flags & REQ_F_CQE_SKIP) 957 return -EINVAL; 958 959 notif = zc->notif = io_alloc_notif(ctx); 960 if (!notif) 961 return -ENOMEM; 962 notif->cqe.user_data = req->cqe.user_data; 963 notif->cqe.res = 0; 964 notif->cqe.flags = IORING_CQE_F_NOTIF; 965 req->flags |= REQ_F_NEED_CLEANUP; 966 967 zc->flags = READ_ONCE(sqe->ioprio); 968 if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) { 969 if (zc->flags & ~IO_ZC_FLAGS_VALID) 970 return -EINVAL; 971 if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) { 972 io_notif_set_extended(notif); 973 io_notif_to_data(notif)->zc_report = true; 974 } 975 } 976 977 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 978 unsigned idx = READ_ONCE(sqe->buf_index); 979 980 if (unlikely(idx >= ctx->nr_user_bufs)) 981 return -EFAULT; 982 idx = array_index_nospec(idx, ctx->nr_user_bufs); 983 req->imu = READ_ONCE(ctx->user_bufs[idx]); 984 io_req_set_rsrc_node(notif, ctx, 0); 985 } 986 987 if (req->opcode == IORING_OP_SEND_ZC) { 988 if (READ_ONCE(sqe->__pad3[0])) 989 return -EINVAL; 990 zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 991 zc->addr_len = READ_ONCE(sqe->addr_len); 992 } else { 993 if (unlikely(sqe->addr2 || sqe->file_index)) 994 return -EINVAL; 995 if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF)) 996 return -EINVAL; 997 } 998 999 zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1000 zc->len = READ_ONCE(sqe->len); 1001 zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 1002 if (zc->msg_flags & MSG_DONTWAIT) 1003 req->flags |= REQ_F_NOWAIT; 1004 1005 zc->done_io = 0; 1006 1007 #ifdef CONFIG_COMPAT 1008 if (req->ctx->compat) 1009 zc->msg_flags |= MSG_CMSG_COMPAT; 1010 #endif 1011 return 0; 1012 } 1013 1014 static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb, 1015 struct iov_iter *from, size_t length) 1016 { 1017 skb_zcopy_downgrade_managed(skb); 1018 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); 1019 } 1020 1021 static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb, 1022 struct iov_iter *from, size_t length) 1023 { 1024 struct skb_shared_info *shinfo = skb_shinfo(skb); 1025 int frag = shinfo->nr_frags; 1026 int ret = 0; 1027 struct bvec_iter bi; 1028 ssize_t copied = 0; 1029 unsigned long truesize = 0; 1030 1031 if (!frag) 1032 shinfo->flags |= SKBFL_MANAGED_FRAG_REFS; 1033 else if (unlikely(!skb_zcopy_managed(skb))) 1034 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); 1035 1036 bi.bi_size = min(from->count, length); 1037 bi.bi_bvec_done = from->iov_offset; 1038 bi.bi_idx = 0; 1039 1040 while (bi.bi_size && frag < MAX_SKB_FRAGS) { 1041 struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi); 1042 1043 copied += v.bv_len; 1044 truesize += PAGE_ALIGN(v.bv_len + v.bv_offset); 1045 __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page, 1046 v.bv_offset, v.bv_len); 1047 bvec_iter_advance_single(from->bvec, &bi, v.bv_len); 1048 } 1049 if (bi.bi_size) 1050 ret = -EMSGSIZE; 1051 1052 shinfo->nr_frags = frag; 1053 from->bvec += bi.bi_idx; 1054 from->nr_segs -= bi.bi_idx; 1055 from->count -= copied; 1056 from->iov_offset = bi.bi_bvec_done; 1057 1058 skb->data_len += copied; 1059 skb->len += copied; 1060 skb->truesize += truesize; 1061 1062 if (sk && sk->sk_type == SOCK_STREAM) { 1063 sk_wmem_queued_add(sk, truesize); 1064 if (!skb_zcopy_pure(skb)) 1065 sk_mem_charge(sk, truesize); 1066 } else { 1067 refcount_add(truesize, &skb->sk->sk_wmem_alloc); 1068 } 1069 return ret; 1070 } 1071 1072 int io_send_zc(struct io_kiocb *req, unsigned int issue_flags) 1073 { 1074 struct sockaddr_storage __address; 1075 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 1076 struct msghdr msg; 1077 struct iovec iov; 1078 struct socket *sock; 1079 unsigned msg_flags; 1080 int ret, min_ret = 0; 1081 1082 sock = sock_from_file(req->file); 1083 if (unlikely(!sock)) 1084 return -ENOTSOCK; 1085 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 1086 return -EOPNOTSUPP; 1087 1088 msg.msg_name = NULL; 1089 msg.msg_control = NULL; 1090 msg.msg_controllen = 0; 1091 msg.msg_namelen = 0; 1092 1093 if (zc->addr) { 1094 if (req_has_async_data(req)) { 1095 struct io_async_msghdr *io = req->async_data; 1096 1097 msg.msg_name = &io->addr; 1098 } else { 1099 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address); 1100 if (unlikely(ret < 0)) 1101 return ret; 1102 msg.msg_name = (struct sockaddr *)&__address; 1103 } 1104 msg.msg_namelen = zc->addr_len; 1105 } 1106 1107 if (!(req->flags & REQ_F_POLLED) && 1108 (zc->flags & IORING_RECVSEND_POLL_FIRST)) 1109 return io_setup_async_addr(req, &__address, issue_flags); 1110 1111 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 1112 ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu, 1113 (u64)(uintptr_t)zc->buf, zc->len); 1114 if (unlikely(ret)) 1115 return ret; 1116 msg.sg_from_iter = io_sg_from_iter; 1117 } else { 1118 io_notif_set_extended(zc->notif); 1119 ret = import_single_range(ITER_SOURCE, zc->buf, zc->len, &iov, 1120 &msg.msg_iter); 1121 if (unlikely(ret)) 1122 return ret; 1123 ret = io_notif_account_mem(zc->notif, zc->len); 1124 if (unlikely(ret)) 1125 return ret; 1126 msg.sg_from_iter = io_sg_from_iter_iovec; 1127 } 1128 1129 msg_flags = zc->msg_flags | MSG_ZEROCOPY; 1130 if (issue_flags & IO_URING_F_NONBLOCK) 1131 msg_flags |= MSG_DONTWAIT; 1132 if (msg_flags & MSG_WAITALL) 1133 min_ret = iov_iter_count(&msg.msg_iter); 1134 1135 msg.msg_flags = msg_flags; 1136 msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg; 1137 ret = sock_sendmsg(sock, &msg); 1138 1139 if (unlikely(ret < min_ret)) { 1140 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1141 return io_setup_async_addr(req, &__address, issue_flags); 1142 1143 if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { 1144 zc->len -= ret; 1145 zc->buf += ret; 1146 zc->done_io += ret; 1147 req->flags |= REQ_F_PARTIAL_IO; 1148 return io_setup_async_addr(req, &__address, issue_flags); 1149 } 1150 if (ret == -ERESTARTSYS) 1151 ret = -EINTR; 1152 req_set_fail(req); 1153 } 1154 1155 if (ret >= 0) 1156 ret += zc->done_io; 1157 else if (zc->done_io) 1158 ret = zc->done_io; 1159 1160 /* 1161 * If we're in io-wq we can't rely on tw ordering guarantees, defer 1162 * flushing notif to io_send_zc_cleanup() 1163 */ 1164 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 1165 io_notif_flush(zc->notif); 1166 req->flags &= ~REQ_F_NEED_CLEANUP; 1167 } 1168 io_req_set_res(req, ret, IORING_CQE_F_MORE); 1169 return IOU_OK; 1170 } 1171 1172 int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags) 1173 { 1174 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 1175 struct io_async_msghdr iomsg, *kmsg; 1176 struct socket *sock; 1177 unsigned flags; 1178 int ret, min_ret = 0; 1179 1180 io_notif_set_extended(sr->notif); 1181 1182 sock = sock_from_file(req->file); 1183 if (unlikely(!sock)) 1184 return -ENOTSOCK; 1185 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 1186 return -EOPNOTSUPP; 1187 1188 if (req_has_async_data(req)) { 1189 kmsg = req->async_data; 1190 } else { 1191 ret = io_sendmsg_copy_hdr(req, &iomsg); 1192 if (ret) 1193 return ret; 1194 kmsg = &iomsg; 1195 } 1196 1197 if (!(req->flags & REQ_F_POLLED) && 1198 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 1199 return io_setup_async_msg(req, kmsg, issue_flags); 1200 1201 flags = sr->msg_flags | MSG_ZEROCOPY; 1202 if (issue_flags & IO_URING_F_NONBLOCK) 1203 flags |= MSG_DONTWAIT; 1204 if (flags & MSG_WAITALL) 1205 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 1206 1207 kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg; 1208 kmsg->msg.sg_from_iter = io_sg_from_iter_iovec; 1209 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); 1210 1211 if (unlikely(ret < min_ret)) { 1212 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1213 return io_setup_async_msg(req, kmsg, issue_flags); 1214 1215 if (ret > 0 && io_net_retry(sock, flags)) { 1216 sr->done_io += ret; 1217 req->flags |= REQ_F_PARTIAL_IO; 1218 return io_setup_async_msg(req, kmsg, issue_flags); 1219 } 1220 if (ret == -ERESTARTSYS) 1221 ret = -EINTR; 1222 req_set_fail(req); 1223 } 1224 /* fast path, check for non-NULL to avoid function call */ 1225 if (kmsg->free_iov) { 1226 kfree(kmsg->free_iov); 1227 kmsg->free_iov = NULL; 1228 } 1229 1230 io_netmsg_recycle(req, issue_flags); 1231 if (ret >= 0) 1232 ret += sr->done_io; 1233 else if (sr->done_io) 1234 ret = sr->done_io; 1235 1236 /* 1237 * If we're in io-wq we can't rely on tw ordering guarantees, defer 1238 * flushing notif to io_send_zc_cleanup() 1239 */ 1240 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 1241 io_notif_flush(sr->notif); 1242 req->flags &= ~REQ_F_NEED_CLEANUP; 1243 } 1244 io_req_set_res(req, ret, IORING_CQE_F_MORE); 1245 return IOU_OK; 1246 } 1247 1248 void io_sendrecv_fail(struct io_kiocb *req) 1249 { 1250 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 1251 1252 if (req->flags & REQ_F_PARTIAL_IO) 1253 req->cqe.res = sr->done_io; 1254 1255 if ((req->flags & REQ_F_NEED_CLEANUP) && 1256 (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC)) 1257 req->cqe.flags |= IORING_CQE_F_MORE; 1258 } 1259 1260 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1261 { 1262 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1263 unsigned flags; 1264 1265 if (sqe->len || sqe->buf_index) 1266 return -EINVAL; 1267 1268 accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1269 accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 1270 accept->flags = READ_ONCE(sqe->accept_flags); 1271 accept->nofile = rlimit(RLIMIT_NOFILE); 1272 flags = READ_ONCE(sqe->ioprio); 1273 if (flags & ~IORING_ACCEPT_MULTISHOT) 1274 return -EINVAL; 1275 1276 accept->file_slot = READ_ONCE(sqe->file_index); 1277 if (accept->file_slot) { 1278 if (accept->flags & SOCK_CLOEXEC) 1279 return -EINVAL; 1280 if (flags & IORING_ACCEPT_MULTISHOT && 1281 accept->file_slot != IORING_FILE_INDEX_ALLOC) 1282 return -EINVAL; 1283 } 1284 if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1285 return -EINVAL; 1286 if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) 1287 accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1288 if (flags & IORING_ACCEPT_MULTISHOT) 1289 req->flags |= REQ_F_APOLL_MULTISHOT; 1290 return 0; 1291 } 1292 1293 int io_accept(struct io_kiocb *req, unsigned int issue_flags) 1294 { 1295 struct io_ring_ctx *ctx = req->ctx; 1296 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1297 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1298 unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; 1299 bool fixed = !!accept->file_slot; 1300 struct file *file; 1301 int ret, fd; 1302 1303 if (!io_check_multishot(req, issue_flags)) 1304 return -EAGAIN; 1305 retry: 1306 if (!fixed) { 1307 fd = __get_unused_fd_flags(accept->flags, accept->nofile); 1308 if (unlikely(fd < 0)) 1309 return fd; 1310 } 1311 file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, 1312 accept->flags); 1313 if (IS_ERR(file)) { 1314 if (!fixed) 1315 put_unused_fd(fd); 1316 ret = PTR_ERR(file); 1317 if (ret == -EAGAIN && force_nonblock) { 1318 /* 1319 * if it's multishot and polled, we don't need to 1320 * return EAGAIN to arm the poll infra since it 1321 * has already been done 1322 */ 1323 if (issue_flags & IO_URING_F_MULTISHOT) 1324 ret = IOU_ISSUE_SKIP_COMPLETE; 1325 return ret; 1326 } 1327 if (ret == -ERESTARTSYS) 1328 ret = -EINTR; 1329 req_set_fail(req); 1330 } else if (!fixed) { 1331 fd_install(fd, file); 1332 ret = fd; 1333 } else { 1334 ret = io_fixed_fd_install(req, issue_flags, file, 1335 accept->file_slot); 1336 } 1337 1338 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 1339 io_req_set_res(req, ret, 0); 1340 return IOU_OK; 1341 } 1342 1343 if (ret < 0) 1344 return ret; 1345 if (io_aux_cqe(ctx, issue_flags & IO_URING_F_COMPLETE_DEFER, 1346 req->cqe.user_data, ret, IORING_CQE_F_MORE, true)) 1347 goto retry; 1348 1349 return -ECANCELED; 1350 } 1351 1352 int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1353 { 1354 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1355 1356 if (sqe->addr || sqe->rw_flags || sqe->buf_index) 1357 return -EINVAL; 1358 1359 sock->domain = READ_ONCE(sqe->fd); 1360 sock->type = READ_ONCE(sqe->off); 1361 sock->protocol = READ_ONCE(sqe->len); 1362 sock->file_slot = READ_ONCE(sqe->file_index); 1363 sock->nofile = rlimit(RLIMIT_NOFILE); 1364 1365 sock->flags = sock->type & ~SOCK_TYPE_MASK; 1366 if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) 1367 return -EINVAL; 1368 if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1369 return -EINVAL; 1370 return 0; 1371 } 1372 1373 int io_socket(struct io_kiocb *req, unsigned int issue_flags) 1374 { 1375 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1376 bool fixed = !!sock->file_slot; 1377 struct file *file; 1378 int ret, fd; 1379 1380 if (!fixed) { 1381 fd = __get_unused_fd_flags(sock->flags, sock->nofile); 1382 if (unlikely(fd < 0)) 1383 return fd; 1384 } 1385 file = __sys_socket_file(sock->domain, sock->type, sock->protocol); 1386 if (IS_ERR(file)) { 1387 if (!fixed) 1388 put_unused_fd(fd); 1389 ret = PTR_ERR(file); 1390 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1391 return -EAGAIN; 1392 if (ret == -ERESTARTSYS) 1393 ret = -EINTR; 1394 req_set_fail(req); 1395 } else if (!fixed) { 1396 fd_install(fd, file); 1397 ret = fd; 1398 } else { 1399 ret = io_fixed_fd_install(req, issue_flags, file, 1400 sock->file_slot); 1401 } 1402 io_req_set_res(req, ret, 0); 1403 return IOU_OK; 1404 } 1405 1406 int io_connect_prep_async(struct io_kiocb *req) 1407 { 1408 struct io_async_connect *io = req->async_data; 1409 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1410 1411 return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); 1412 } 1413 1414 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1415 { 1416 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1417 1418 if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) 1419 return -EINVAL; 1420 1421 conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1422 conn->addr_len = READ_ONCE(sqe->addr2); 1423 conn->in_progress = false; 1424 return 0; 1425 } 1426 1427 int io_connect(struct io_kiocb *req, unsigned int issue_flags) 1428 { 1429 struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect); 1430 struct io_async_connect __io, *io; 1431 unsigned file_flags; 1432 int ret; 1433 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1434 1435 if (connect->in_progress) { 1436 struct socket *socket; 1437 1438 ret = -ENOTSOCK; 1439 socket = sock_from_file(req->file); 1440 if (socket) 1441 ret = sock_error(socket->sk); 1442 goto out; 1443 } 1444 1445 if (req_has_async_data(req)) { 1446 io = req->async_data; 1447 } else { 1448 ret = move_addr_to_kernel(connect->addr, 1449 connect->addr_len, 1450 &__io.address); 1451 if (ret) 1452 goto out; 1453 io = &__io; 1454 } 1455 1456 file_flags = force_nonblock ? O_NONBLOCK : 0; 1457 1458 ret = __sys_connect_file(req->file, &io->address, 1459 connect->addr_len, file_flags); 1460 if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { 1461 if (ret == -EINPROGRESS) { 1462 connect->in_progress = true; 1463 } else { 1464 if (req_has_async_data(req)) 1465 return -EAGAIN; 1466 if (io_alloc_async_data(req)) { 1467 ret = -ENOMEM; 1468 goto out; 1469 } 1470 memcpy(req->async_data, &__io, sizeof(__io)); 1471 } 1472 return -EAGAIN; 1473 } 1474 if (ret == -ERESTARTSYS) 1475 ret = -EINTR; 1476 out: 1477 if (ret < 0) 1478 req_set_fail(req); 1479 io_req_set_res(req, ret, 0); 1480 return IOU_OK; 1481 } 1482 1483 void io_netmsg_cache_free(struct io_cache_entry *entry) 1484 { 1485 kfree(container_of(entry, struct io_async_msghdr, cache)); 1486 } 1487 #endif 1488